CN110042183B - Blast furnace burden distribution method - Google Patents
Blast furnace burden distribution method Download PDFInfo
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- CN110042183B CN110042183B CN201910216677.1A CN201910216677A CN110042183B CN 110042183 B CN110042183 B CN 110042183B CN 201910216677 A CN201910216677 A CN 201910216677A CN 110042183 B CN110042183 B CN 110042183B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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Abstract
The invention discloses a blast furnace burden distribution method, and belongs to the technical field of steel smelting. The blast furnace burden distribution method comprises the following steps: acquiring a radius difference R0 between the reference blanking point and the set blanking point; obtaining the radius R1 of the set blanking point according to the radius R of the reference blanking point and the radius difference R0; obtaining the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point according to the radius R of the reference blanking point and the radius R1 of the set blanking point; obtaining a rotating speed V1 of the set blanking point according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point; the chute distributes the material at a set blanking point with the V1. The method for distributing the blast furnace can improve the control precision of the distribution quantity of the blast furnace, improve the uniformity and the accuracy of the distribution of the blast furnace, promote the stable distribution of the blast furnace gas and be beneficial to the long-term stable operation of the blast furnace.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a blast furnace burden distribution method.
Background
At present, a bell-less furnace top device is used for charging an iron-making blast furnace, and the distribution of the blast furnace is realized by matching the opening degree of a throttle valve, weighing and the number of turns of a chute.
Two methods are commonly used for distributing materials: time and weight methods.
1. The time method is that when the chute rotates for distributing, the opening of the throttle valve is unchanged, the rotating speed of the chute is unchanged, and the charging adjustment is realized by adjusting the ring position and the number of turns. The actual number of turns of distribution is obtained by dividing the discharging time by the rotating speed of the chute, and when the actual number of turns of distribution is unequal to the set number of turns, the opening of the throttle valve can be adjusted by adding or subtracting the next discharging.
2. The gravimetric method is that the opening of the regulating valve is controlled by a weight closed loop, and the rotating speed of the chute is not changed. When the throttling discharge is opened, continuously comparing the residual quantity in the tank with the rest material distribution ring number, calculating the opening degree of the material flow regulating valve by contrasting the discharge speed curve, and adjusting. And finally, after the distribution chute rotates for a set number of turns, the furnace burden is just distributed.
However, when the chute angle is larger, the movement locus of the material flow scatters and flies under the action of centrifugal force in the two methods, and accurate material distribution cannot be realized.
Disclosure of Invention
The invention provides a method for distributing materials for a blast furnace, which solves or partially solves the technical problem that the material distribution method in the prior art cannot realize accurate material distribution.
In order to solve the technical problem, the invention provides a blast furnace burden distribution method which comprises the following steps: acquiring a radius difference R0 between the reference blanking point and the set blanking point; obtaining the radius R1 of the set blanking point according to the radius R of the reference blanking point and the radius difference R0; obtaining a ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point according to the radius R of the reference blanking point and the radius R1 of the set blanking point; obtaining the rotating speed V1 of the set blanking point according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point; the chute distributes materials at the set blanking point by the V1.
Further, the radius difference R0 is obtained according to formula one; the first formula is as follows: r0 ═ (α 1- α) × β; beta is the variation coefficient of the tilting angle of the chute and the blanking point; the alpha is a tilting reference angle of the chute at the reference blanking point; and the alpha 1 is a set inclination angle of the chute at the set blanking point.
Further, the obtaining of the coefficient of variation β between the tilting angle of the chute and the blanking point includes: and when the tilting angle of the chute changes by 1 degree, the radius difference between the two blanking points is beta.
Further, the radius R1 of the set blanking point is obtained by a formula two, where the formula two is: r1 ═ R + R0; wherein: the R1 is the radius of the set blanking point, the R is the radius R of the reference blanking point, and the R0 is the radius difference between the reference blanking point and the set blanking point.
Further, the obtaining the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point includes: the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point is obtained through a formula III, and U is R/R1; wherein U is a ratio of a perimeter of the reference blanking point to a perimeter of the set blanking point, R1 is a radius of the set blanking point, and R is a radius R of the reference blanking point.
Further, the obtaining of the rotation speed V1 of the set blanking point includes: the rotating speed V1 of the set blanking point is obtained through a formula IV, and V1 is U V; v1 is the rotating speed of the set blanking point, U is the ratio of the perimeter of the reference blanking point to the perimeter of the set blanking point, and the set rotating speed V of the chute of the reference blanking point.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
because the radius difference R0 between the reference blanking point and the set blanking point is obtained, the radius R1 of the set blanking point is obtained according to the radius R of the reference blanking point and the radius difference R0, the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point is obtained according to the radius R of the reference blanking point and the radius R1 of the set blanking point, the rotating speed V1 of the set blanking point is obtained according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point, and the chute distributes materials at the set blanking point through the V1, the uniform distribution of each circle during multi-circle distribution can be realized through the change of the rotating speed of the chute, the consistency of the material layer thickness of each circle is ensured, the phenomenon that the moving track of the material flow is scattered due to the centrifugal force effect is avoided, the control precision of the material distribution quantity of the blast furnace can be improved, and the uniformity and the accuracy of the material distribution of the blast furnace are improved, can promote the stable distribution of blast furnace gas and is beneficial to the long-term stable operation of the blast furnace.
Drawings
FIG. 1 is a schematic flow chart of a method for distributing material in a blast furnace according to an embodiment of the present invention;
FIG. 2 is a schematic view of the burden distribution of the blast furnace of FIG. 1;
FIG. 3 is a graph of the angle of inclination of the chute with respect to the drop point for the blast furnace burden distribution process of FIG. 1.
Detailed Description
Referring to fig. 1-2, a method for distributing material in a blast furnace provided by the embodiment of the invention includes the following steps:
step 1, obtaining a radius difference R0 between a reference blanking point and a set blanking point.
And 2, obtaining the radius R1 of the set blanking point according to the radius R of the reference blanking point and the radius difference R0.
And 3, obtaining the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point according to the radius R of the reference blanking point and the radius R1 of the set blanking point.
And 4, obtaining the rotating speed V1 of the set blanking point according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point.
And step 5, distributing the material at the set blanking point by the chute at a V1.
In the embodiment of the application, because the radius difference R0 between the reference blanking point and the set blanking point is obtained, the radius R1 of the set blanking point is obtained according to the radius R and the radius difference R0 of the reference blanking point, the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point is obtained according to the radius R of the reference blanking point and the radius R1 of the set blanking point, the rotating speed V1 of the set blanking point is obtained according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point, and the chute distributes materials at the set blanking point by the V1, the uniform distribution of each circle in multi-circle distribution can be realized through the change of the rotating speed of the chute, the consistency of the thickness of the material layer of each circle is ensured, the phenomenon that the moving track of the material flow scatters and flies due to the effect of the centrifugal force is avoided, and the control precision of the distribution quantity of the blast furnace can be improved, the uniformity and the accuracy of the blast furnace burden distribution are improved, the stable distribution of the blast furnace gas can be promoted, and the long-term stable operation of the blast furnace is facilitated.
Step 1 is described in detail.
The radius difference R0 is obtained according to the formula I;
the first formula is as follows: r0 ═ (α 1- α) × β;
beta is the variation coefficient of the tilting angle of the chute and the blanking point; the alpha is a tilting reference angle of the chute at the reference blanking point; and the alpha 1 is a set inclination angle of the chute at the set blanking point.
Obtaining a coefficient of variation beta between the tilting angle of the chute and the blanking point comprises: when the tilting angle of the chute changes by 1 degree, the radius difference between the two blanking points is beta.
The coefficient of variation beta of the tilting angle and the blanking point is that 1:1, the furnace top equipment is obtained by manual measurement after discharging, namely: the change coefficient beta of the tilting angle and the blanking point is obtained by measuring the charge level of the blast furnace, namely manually detecting the charge in the furnace after the charge is discharged, taking the blast furnace with 5500 cubic meters of first steel as an example, the radius difference of the two blanking points is measured to be about 0.19 meter when the tilting angle of the chute changes 1 degree.
Step 2 is described in detail.
The obtaining of the radius R1 of the set blanking point includes:
the radius R1 of the set blanking point is obtained through a formula II: r1 ═ R + R0;
wherein: the R1 is the radius of the set blanking point, the R is the radius R of the reference blanking point, and the R0 is the radius difference between the reference blanking point and the set blanking point.
Step 3 is described in detail.
The obtaining of the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point comprises:
the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point is obtained through a third formula,
U＝R/R1；
wherein U is a ratio of a perimeter of the reference blanking point to a perimeter of the set blanking point, R1 is a radius of the set blanking point, and R is a radius R of the reference blanking point.
Step 4 is described in detail.
The step of obtaining the rotating speed V1 of the set blanking point comprises the following steps:
the rotating speed V1 of the set blanking point is obtained by a formula IV,
V1＝U*V；
v1 is the rotating speed of the set blanking point, U is the ratio of the perimeter of the reference blanking point to the perimeter of the set blanking point, and the set rotating speed V of the chute of the reference blanking point.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
Application method 1
Setting a rotating speed V of the chute of the reference blanking point, wherein beta is a variation coefficient of the tilting angle of the chute and the blanking point; the tilting reference angle of the chute at the reference blanking point is alpha, alpha 1 is a set inclination angle of the chute at the set blanking point, and the radius of the reference blanking point is R.
R0 ═ (α 1- α) × β; beta is: the variation coefficient of the tilting angle of the chute and the blanking point; the alpha is a tilting reference angle of the chute at the reference blanking point; and the alpha 1 is a set inclination angle of the chute at the set blanking point.
The radius R1, R1 ═ R + R0 of the set drop point was obtained.
And obtaining the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point according to the radius R of the reference blanking point and the radius R1 of the set blanking point, wherein U is R/R1.
And obtaining the rotating speed V1 of the set blanking point according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point, wherein V1 is U V.
The chute rotating speed V1 corresponding to different chute inclination angles is obtained, the chute distributes materials at a set blanking point by V1, the uniformity of the materials distributed at the same running distance is ensured, the uniform material distribution of each circle of each ring is realized by the change of the chute rotating speed during multi-ring material distribution, the material layer thickness of each circle of materials is ensured to be consistent, the phenomenon that the movement track of the materials flows scatters and flies out due to the action of centrifugal force is avoided, the control precision of the material distribution quantity of the blast furnace can be improved, the uniformity and the accuracy of the material distribution of the blast furnace are improved, the stable distribution of blast furnace gas can be promoted, and the long-term stable running of the blast furnace is facilitated.
Application method 2
When a is 22 degrees, the radius of the reference blanking point is 2.4 meters, the rotating speed of a chute motor of the chute at the reference blanking point is set to 700 revolutions, at the moment, 8.5 seconds are needed for one revolution of the chute, referring to fig. 3, according to the distribution experiment result of the 1:1 Jingtang blast furnace in 2018, the relation between the change of the chute tilting angle and the blanking point can be obtained, in the diagram, it can be seen that the tilting angle and the blanking point are almost linearly changed in the commonly used tilting change range of the distribution chute, taking a first steel 5500 cubic meter blast furnace as an example, that is, the radius is different by 0.19 meters every time the tilting angle is changed by 1 degree, namely, the change coefficient beta of the tilting angle and the blanking point of the chute is 0.19 meters.
When the angle a1 is 30 °, i.e.:
r1 ═ R-R0 ═ R + (a1-a) × 0.19 ═ 2.4+ (30-22) × 0.19 ═ 3.92 (meters);
U＝R/R1＝2.4/3.92＝0.61；
v1 ═ U ═ V ═ 0.61 ═ 700 ═ 427 (rev/min).
The chute distributes materials at a set blanking point in 427 (revolutions per minute), so that the uniformity of the materials distributed at the same running distance is ensured, the uniform material distribution of each circle of each ring is realized when multi-ring material distribution is realized through the change of the rotating speed of the chute, the material layer thickness of each circle of materials is ensured to be consistent, the phenomenon that the movement track of the material flow scatters and flies out due to the action of centrifugal force is avoided, the control precision of the material distribution quantity of the blast furnace can be improved, the uniformity and the accuracy of the material distribution of the blast furnace are improved, the stable distribution of blast furnace gas can be promoted, and the long-term stable running of the blast furnace is.
The rotation time of the chute at each blanking point is the same, but the chute rotating speed in the prior art is unchanged, the material put in each circle is the same no matter the circumference of the chute outlet, namely the chute swing angle is larger, the material layer distributed in each circle is thinner, the chute swing angle is smaller, the material layer distributed in each circle is thicker, the adjustment of the material distribution thickness is realized by increasing or decreasing the number of circles, the chute also distributes the material at the same speed when the chute angle is larger, and the movement track of the material flow scatters and flies out due to the action of centrifugal force, so that accurate material distribution cannot be realized. When the swing angle of the chute is increased, the circumference of the outlet of the chute is increased, so that the material layer thickness is ensured by slowing down the rotating speed of the chute; when chute swing angle reduces, chute outlet girth reduces, this application is through improving the chute rotational speed, do not make the bed of material too thick, change through the chute rotational speed and adjust charge level distribution, the even cloth of every round of each ring when the change of chute rotational speed has realized the polycyclic cloth, guarantee that the bed of material thickness of each circle material is unanimous, the phenomenon of the movement track of the material stream of having avoided leading to because the centrifugal force effect spills the departure, can improve the control accuracy of blast furnace cloth volume, improve the homogeneity and the accuracy of blast furnace cloth, can promote blast furnace gas distribution stability, do benefit to the long-term steady operation of blast furnace.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (5)
1. The blast furnace burden distribution method is characterized by comprising the following steps:
acquiring a radius difference R0 between the reference blanking point and the set blanking point;
obtaining the radius R1 of the set blanking point according to the radius R of the reference blanking point and the radius difference R0;
obtaining a ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point according to the radius R of the reference blanking point and the radius R1 of the set blanking point;
obtaining the rotating speed V1 of the set blanking point according to the set rotating speed V of the chute of the reference blanking point and the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point;
the chute distributes materials at the set blanking point by the V1;
the step of obtaining the rotating speed V1 of the set blanking point comprises the following steps:
the rotating speed V1 of the set blanking point is obtained by a formula IV,
V1＝U*V；
v1 is the rotating speed of the set blanking point, U is the ratio of the perimeter of the reference blanking point to the perimeter of the set blanking point, and the set rotating speed V of the chute of the reference blanking point.
2. The blast furnace burden distributing method according to claim 1, characterized by comprising:
the radius difference R0 is obtained according to a formula I;
the first formula is as follows: r0 ═ (α 1- α) × β;
wherein: beta is the variation coefficient of the tilting angle of the chute and the blanking point; the alpha is a tilting reference angle of the chute at the reference blanking point; and the alpha 1 is a set inclination angle of the chute at the set blanking point.
3. The blast furnace burden distributing method according to claim 2, wherein the coefficient of variation β of the chute's tilt angle from the drop point comprises:
and when the tilting angle of the chute changes by 1 degree, the radius difference between the two blanking points is beta.
4. The blast furnace burden distributing method according to claim 1, wherein the obtaining of the radius R1 of the set blanking point comprises:
the radius R1 of the set blanking point is obtained through a formula II: r1 ═ R + R0;
wherein: the R1 is the radius of the set blanking point, the R is the radius R of the reference blanking point, and the R0 is the radius difference between the reference blanking point and the set blanking point.
5. The blast furnace burden distribution method according to claim 1, wherein the obtaining of the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point comprises:
the ratio U of the perimeter of the reference blanking point to the perimeter of the set blanking point is obtained through a third formula,
U＝R/R1；
wherein U is a ratio of a perimeter of the reference blanking point to a perimeter of the set blanking point, R1 is a radius of the set blanking point, and R is a radius R of the reference blanking point.
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| SU908432A1 (en) * | 1980-06-05 | 1982-02-28 | Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт | Shaft furnace charging method |
| JPS60135507A (en) * | 1983-12-22 | 1985-07-18 | Kawasaki Steel Corp | Method for charging raw material to blast furnace |
| CN101250602B (en) * | 2008-03-20 | 2010-11-03 | 重庆钢铁(集团)有限责任公司 | Blast furnace chute polycyclic distributing method |
| CN103243188A (en) * | 2012-02-10 | 2013-08-14 | 吴蔓洁 | Method and device for material distribution of blast furnace bell-less top |
| CN102559965B (en) * | 2012-02-27 | 2013-09-04 | 江苏省沙钢钢铁研究院有限公司 | Method for simulating circumferential deflection of material distribution of blast furnace |
| CN104946838A (en) * | 2015-07-21 | 2015-09-30 | 方大特钢科技股份有限公司 | Blast furnace fan-shaped distribution method |
| CN106222342A (en) * | 2016-08-23 | 2016-12-14 | 北京首钢自动化信息技术有限公司 | A kind of control method of blast furnace roof material distributing precision |
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